Ultraviolet-curable resin composition and use thereof

1. A multilayer optical disc comprising at least two recording layers and a cured transparent resin intermediate layer between the at least two recording layers, wherein a surface of the cured transparent resin intermediate layer has guide grooves therein, wherein the guide grooves are formed by a 2P method and wherein one of said at least two recording layers is formed on said guide grooves, and wherein said cured transparent resin intermediate layer is formed from an ultraviolet-curable resin composition comprising: (A) dioxane glycol di(meth)acrylate and/or tricyclodecane dimethylol di(meth)acrylate; and (B) a photopolymerization initiator.

2. The multilayer optical disc according to claim 1 , wherein said ultraviolet-curable resin composition further comprises (C) a compound having in a molecule thereof at least two (meth)acryloyl groups.

3. The multilayer optical disc according to claim 2 , comprising 15 to 85% by weight of the (A) component, 0.1 to 10% by weight of the (B) component and 10 to 80% by weight of the (C) component in relation to a weight of the whole resin composition.

4. The multilayer optical disc according to claim 2 , wherein said ultraviolet-curable resin composition further comprises (D) a mono(meth)acrylate compound.

5. The multilayer optical disc according to claim 4 , comprising 15 to 85% by weight of the (A) component, 0.1 to 10% by weight of the (B) component, 8 to 80% by weight of the (C) component and 5 to 40% by weight of the (D) component in relation to the weight of the whole resin composition.

6. The multilayer optical disc according to any one of claims 2 to 5 , wherein the compound (C) having in the molecule thereof at least two or more (meth)acryloyl groups comprises one or more selected from the group consisting of trimethylolpropane triacrylate, pentaerythritol triacrylate, ditrimethylolpropane tetraacrylate, tris[acroyloxyethyl] isocyanurate, dipentaerythritol hexaacrylate, tripropylene glycol diacrylate and neopentylglycol polypropoxy diacrylate.

7. The multilayer optical disc according to claim 4 , wherein the mono(meth)acrylate compound (D) comprises one or more selected from the group consisting of dicyclopentenyl oxyethyl acrylate, lauryl acrylate and methoxytripropylene glycol acrylate.

8. The multilayer optical disc according to any one of claims 1 to 4 , wherein the photopolymerization initiator (B) is 1-hydroxy-cyclohexyl phenyl ketone or 2,4,6-trimethylbenzoyl diphenyl phosphine oxide.

9. The multilayer optical disc according to any one of claims 1 to 5 , wherein the viscosity of the composition at 25° C. measured with a B-type viscometer is 30 to 800 mPa·s.